Some code are missing and not showing video - Computers & Internet

A codec is a computer program, used to compress a movie of large size or encode/decode digital data into something that your computer can understand and play. And a codec pack is a collection of different codes, with which users can play those generally non-supported videos/audios by Windows/Mac/Linux computer and its software.
You can install codec packs onto your video player or you can just try some other free video players such as Leawo Blu-ray Player

Download cccp and xvid codec then it will show all video

cccp can be found here http://www.cccp-project.net/
Xvid codec here http://www.koepi.info/Xvid-1.2.2-07062009.exe
if you want ac3(5.1 surrond sound )

then download this too
http://ac3filter.googlecode.com/files/ac3filter_1_63b.exe